package com.bei_en.common.util.interceptor;

import java.io.UnsupportedEncodingException;
import java.lang.reflect.Method;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.bei_en.common.web.JsonFailResult;
import com.bei_en.common.web.MySessionContext;
import com.bei_en.teacher.admin.model.users.vo.UsersVo;
import com.bei_en.teacher.admin.other.Consts;

public class OAuth2Interceptor implements HandlerInterceptor {

	/**
	 * 在DispatcherServlet完全处理完请求后被调用
	 * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
	 */
	@Override
	public void afterCompletion(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		System.out.println("**执行顺序: 3、afterCompletion**");

	}

	/**
	 * 在业务处理器处理请求执行完成后,生成视图之前执行的动作
	 */
	@Override
	public void postHandle(HttpServletRequest request,
			HttpServletResponse response, Object arg2, ModelAndView modelAndView)
			throws Exception {
		System.out.println("**执行顺序: 2、postHandle**");

	}

	/**
	 * 在业务处理器处理请求之前被调用 如果返回false 从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
	 * 如果返回true 执行下一个拦截器,直到所有的拦截器都执行完毕 再执行被拦截的Controller 然后进入拦截器链,
	 * 从最后一个拦截器往回执行所有的postHandle() 接着再从最后一个拦截器往回执行所有的afterCompletion()
	 */
	@Override
	public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler) throws Exception {
		System.out.println("**执行顺序: 1、preHandle**");
		String url = request.getRequestURL().toString();

		HttpSession session = request.getSession();
		// 先判断是否有注解
		if(handler instanceof HandlerMethod){
			HandlerMethod handlerMethod = (HandlerMethod) handler;
			Method method = handlerMethod.getMethod();
			OAuthRequired annotation = method.getAnnotation(OAuthRequired.class);
			if (annotation != null) {
				UsersVo user = (UsersVo) session.getAttribute(Consts.LOGIN_USER);
				if (user == null) {
					// 请求的路径
					String contextPath = request.getContextPath();
					response.sendRedirect(contextPath + "/api/Users/islogin");
					return false;
				}
				HttpSession session2 = MySessionContext
						.getSession(user.getUserId());
				if (session2 == null || !session.getId().equals(session2.getId())) {
				
					// 请求的路径
					String contextPath = request.getContextPath();
					response.sendRedirect(contextPath + "/api/Users/islogin");
					return false;
				}
			}
		}
		return true;
	}

}
